mirror of
https://github.com/djohnlewis/stackdump
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307 lines
11 KiB
Python
307 lines
11 KiB
Python
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from sqlobject.dbconnection import DBAPI
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from sqlobject import col
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import re
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class MSSQLConnection(DBAPI):
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supportTransactions = True
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dbName = 'mssql'
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schemes = [dbName]
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limit_re = re.compile('^\s*(select )(.*)', re.IGNORECASE)
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def __init__(self, db, user, password='', host='localhost', port=None,
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autoCommit=0, **kw):
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drivers = kw.pop('driver', None) or 'adodb,pymssql'
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for driver in drivers.split(','):
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driver = driver.strip()
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if not driver:
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continue
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try:
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if driver in ('adodb', 'adodbapi'):
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import adodbapi as sqlmodule
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elif driver == 'pymssql':
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import pymssql as sqlmodule
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else:
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raise ValueError('Unknown MSSQL driver "%s", expected adodb or pymssql' % driver)
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except ImportError:
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pass
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else:
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break
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else:
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raise ImportError('Cannot find an MSSQL driver, tried %s' % drivers)
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self.module = sqlmodule
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if sqlmodule.__name__ == 'adodbapi':
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self.dbconnection = sqlmodule.connect
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# ADO uses unicode only (AFAIK)
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self.usingUnicodeStrings = True
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# Need to use SQLNCLI provider for SQL Server Express Edition
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if kw.get("ncli"):
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conn_str = "Provider=SQLNCLI;"
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else:
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conn_str = "Provider=SQLOLEDB;"
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conn_str += "Data Source=%s;Initial Catalog=%s;"
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# MSDE does not allow SQL server login
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if kw.get("sspi"):
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conn_str += "Integrated Security=SSPI;Persist Security Info=False"
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self.make_conn_str = lambda keys: [conn_str % (keys.host, keys.db)]
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else:
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conn_str += "User Id=%s;Password=%s"
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self.make_conn_str = lambda keys: [conn_str % (keys.host, keys.db, keys.user, keys.password)]
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kw.pop("sspi", None)
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kw.pop("ncli", None)
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else: # pymssql
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self.dbconnection = sqlmodule.connect
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sqlmodule.Binary = lambda st: str(st)
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# don't know whether pymssql uses unicode
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self.usingUnicodeStrings = False
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self.make_conn_str = lambda keys: \
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["", keys.user, keys.password, keys.host, keys.db]
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self.autoCommit=int(autoCommit)
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self.host = host
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self.port = port
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self.db = db
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self.user = user
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self.password = password
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self.password = password
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self._can_use_max_types = None
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DBAPI.__init__(self, **kw)
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@classmethod
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def _connectionFromParams(cls, user, password, host, port, path, args):
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path = path.strip('/')
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return cls(user=user, password=password,
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host=host or 'localhost', port=port, db=path, **args)
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def insert_id(self, conn):
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"""
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insert_id method.
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"""
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c = conn.cursor()
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# converting the identity to an int is ugly, but it gets returned
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# as a decimal otherwise :S
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c.execute('SELECT CONVERT(INT, @@IDENTITY)')
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return c.fetchone()[0]
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def makeConnection(self):
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con = self.dbconnection( *self.make_conn_str(self) )
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cur = con.cursor()
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cur.execute('SET ANSI_NULLS ON')
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cur.execute("SELECT CAST('12345.21' AS DECIMAL(10, 2))")
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self.decimalSeparator = str(cur.fetchone()[0])[-3]
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cur.close()
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return con
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HAS_IDENTITY = """
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SELECT col.name, col.status, obj.name
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FROM syscolumns col
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JOIN sysobjects obj
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ON obj.id = col.id
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WHERE obj.name = '%s'
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and col.autoval is not null
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"""
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def _hasIdentity(self, conn, table):
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query = self.HAS_IDENTITY % table
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c = conn.cursor()
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c.execute(query)
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r = c.fetchone()
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return r is not None
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def _queryInsertID(self, conn, soInstance, id, names, values):
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"""
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Insert the Initial with names and values, using id.
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"""
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table = soInstance.sqlmeta.table
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idName = soInstance.sqlmeta.idName
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c = conn.cursor()
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has_identity = self._hasIdentity(conn, table)
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if id is not None:
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names = [idName] + names
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values = [id] + values
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elif has_identity and idName in names:
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try:
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i = names.index( idName )
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if i:
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del names[i]
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del values[i]
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except ValueError:
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pass
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if has_identity:
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if id is not None:
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c.execute('SET IDENTITY_INSERT %s ON' % table)
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else:
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c.execute('SET IDENTITY_INSERT %s OFF' % table)
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q = self._insertSQL(table, names, values)
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if self.debug:
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print 'QueryIns: %s' % q
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c.execute(q)
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if has_identity:
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c.execute('SET IDENTITY_INSERT %s OFF' % table)
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if id is None:
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id = self.insert_id(conn)
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if self.debugOutput:
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self.printDebug(conn, id, 'QueryIns', 'result')
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return id
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@classmethod
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def _queryAddLimitOffset(cls, query, start, end):
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if end and not start:
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limit_str = "SELECT TOP %i" % end
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match = cls.limit_re.match(query)
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if match and len(match.groups()) == 2:
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return ' '.join([limit_str, match.group(2)])
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else:
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return query
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def createReferenceConstraint(self, soClass, col):
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return col.mssqlCreateReferenceConstraint()
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def createColumn(self, soClass, col):
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return col.mssqlCreateSQL(self)
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def createIDColumn(self, soClass):
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key_type = {int: "INT", str: "TEXT"}[soClass.sqlmeta.idType]
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return '%s %s IDENTITY UNIQUE' % (soClass.sqlmeta.idName, key_type)
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def createIndexSQL(self, soClass, index):
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return index.mssqlCreateIndexSQL(soClass)
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def joinSQLType(self, join):
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return 'INT NOT NULL'
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SHOW_TABLES="SELECT name FROM sysobjects WHERE type='U'"
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def tableExists(self, tableName):
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for (table,) in self.queryAll(self.SHOW_TABLES):
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if table.lower() == tableName.lower():
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return True
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return False
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def addColumn(self, tableName, column):
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self.query('ALTER TABLE %s ADD %s' %
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(tableName,
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column.mssqlCreateSQL(self)))
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def delColumn(self, sqlmeta, column):
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self.query('ALTER TABLE %s DROP COLUMN %s' % (tableName.table, column.dbName))
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# precision and scale is gotten from column table so that we can create
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# decimal columns if needed
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SHOW_COLUMNS = """
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select
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name,
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length,
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( select name
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from systypes
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where cast(xusertype as int)= cast(sc.xtype as int)
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) datatype,
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prec,
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scale,
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isnullable,
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cdefault,
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m.text default_text,
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isnull(len(autoval),0) is_identity
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from syscolumns sc
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LEFT OUTER JOIN syscomments m on sc.cdefault = m.id
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AND m.colid = 1
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where
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sc.id in (select id
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from sysobjects
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where name = '%s')
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order by
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colorder"""
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def columnsFromSchema(self, tableName, soClass):
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colData = self.queryAll(self.SHOW_COLUMNS
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% tableName)
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results = []
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for field, size, t, precision, scale, nullAllowed, default, defaultText, is_identity in colData:
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if field == soClass.sqlmeta.idName:
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continue
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# precision is needed for decimal columns
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colClass, kw = self.guessClass(t, size, precision, scale)
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kw['name'] = str(soClass.sqlmeta.style.dbColumnToPythonAttr(field))
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kw['dbName'] = str(field)
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kw['notNone'] = not nullAllowed
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if (defaultText):
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# Strip ( and )
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defaultText = defaultText[1:-1]
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if defaultText[0] == "'":
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defaultText = defaultText[1:-1]
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else:
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if t == "int" : defaultText = int(defaultText)
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if t == "float" : defaultText = float(defaultText)
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if t == "numeric": defaultText = float(defaultText)
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# TODO need to access the "column" to_python method here--but the object doesn't exists yet
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# @@ skip key...
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kw['default'] = defaultText
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results.append(colClass(**kw))
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return results
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def _setAutoCommit(self, conn, auto):
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#raise Exception(repr(auto))
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return
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#conn.auto_commit = auto
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option = "ON"
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if auto == 0:
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option = "OFF"
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c = conn.cursor()
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c.execute("SET AUTOCOMMIT " + option)
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conn.setconnectoption(SQL.AUTOCOMMIT, option)
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# precision and scale is needed for decimal columns
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def guessClass(self, t, size, precision, scale):
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"""
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Here we take raw values coming out of syscolumns and map to SQLObject class types.
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"""
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if t.startswith('int'):
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return col.IntCol, {}
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elif t.startswith('varchar'):
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if self.usingUnicodeStrings:
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return col.UnicodeCol, {'length': size}
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return col.StringCol, {'length': size}
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elif t.startswith('char'):
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if self.usingUnicodeStrings:
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return col.UnicodeCol, {'length': size,
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'varchar': False}
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return col.StringCol, {'length': size,
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'varchar': False}
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elif t.startswith('datetime'):
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return col.DateTimeCol, {}
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elif t.startswith('decimal'):
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return col.DecimalCol, {'size': precision, # be careful for awkward naming
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'precision': scale}
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else:
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return col.Col, {}
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def server_version(self):
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try:
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server_version = self.queryAll("SELECT SERVERPROPERTY('productversion')")[0][0]
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server_version = server_version.split('.')[0]
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server_version = int(server_version)
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except:
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server_version = None # unknown
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self.server_version = server_version # cache it forever
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return server_version
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def can_use_max_types(self):
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if self._can_use_max_types is not None:
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return self._can_use_max_types
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server_version = self.server_version()
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self._can_use_max_types = can_use_max_types = \
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(server_version is not None) and (server_version >= 9)
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return can_use_max_types
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